tools: bpf: sync uapi header bpf.h (9ce33e33) · Commits · 戴 / test

tools/include/uapi/linux/bpf.h

+18 −0

Original line number	Diff line number	Diff line
		@@ -260,6 +260,24 @@ enum bpf_attach_type {
		*/
		#define BPF_F_ANY_ALIGNMENT (1U << 1)

		/* BPF_F_TEST_RND_HI32 is used in BPF_PROG_LOAD command for testing purpose.
		* Verifier does sub-register def/use analysis and identifies instructions whose
		* def only matters for low 32-bit, high 32-bit is never referenced later
		* through implicit zero extension. Therefore verifier notifies JIT back-ends
		* that it is safe to ignore clearing high 32-bit for these instructions. This
		* saves some back-ends a lot of code-gen. However such optimization is not
		* necessary on some arches, for example x86_64, arm64 etc, whose JIT back-ends
		* hence hasn't used verifier's analysis result. But, we really want to have a
		* way to be able to verify the correctness of the described optimization on
		* x86_64 on which testsuites are frequently exercised.
		*
		* So, this flag is introduced. Once it is set, verifier will randomize high
		* 32-bit for those instructions who has been identified as safe to ignore them.
		* Then, if verifier is not doing correct analysis, such randomization will
		* regress tests to expose bugs.
		*/
		#define BPF_F_TEST_RND_HI32 (1U << 2)

		/* When BPF ldimm64's insn[0].src_reg != 0 then this can have
		* two extensions:
		*